64655646 has 32 divisors (see below), whose sum is σ = 145622016. Its totient is φ = 18960000.

The previous prime is 64655629. The next prime is 64655659.

It is a happy number.

64655646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64655598 and 64655607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13755 + ... + 17846.

It is an arithmetic number, because the mean of its divisors is an integer number (4550688).

Almost surely, 2^64655646 is an apocalyptic number.

64655646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64655646 is an abundant number, since it is smaller than the sum of its proper divisors (80966370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64655646 is a wasteful number, since it uses less digits than its factorization.

64655646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31648.

The product of its digits is 518400, while the sum is 42.

The square root of 64655646 is about 8040.8734600166. The cubic root of 64655646 is about 401.3612911274.

The spelling of 64655646 in words is "sixty-four million, six hundred fifty-five thousand, six hundred forty-six".